Physics Question Molecules Watch
Q - The densities of water and steam are 1.0 X 10^3 kg/m3 and 6.1 X 10^-1 kg/m3 respectively.
What is the ratio: (Average seperation of steam molecules)/(Average seperation of water molecules) ?
A- 12 B- 40 C- 250 D- 1000
so in one metre cubed there are x molecules of water and y molecules of steam, where
y/x = 6.1*10^-1 / 1*10^3 = 6.1*10^-4
however we want to convert to a length from a volume, so we find the cube root:
cube root = 0.08480
the inverse of this is 11.7 or something, close enough for my liking to 12.